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Glad to see that this time someone else is recommending this too, full of interesting ideas and overall a good hard sci-fi novel. We need more novels about these themes.

Um, hard sci-fi? Some handwavy "upload person to computer" stuff and then "we'll just rearrange the universe over here, don't mind us". I did read it a long time ago, but I don't remember anything that specific in it.

Permutation City is definitely hard sci-fi, albeit less hard than most of Egan's work. Ignoring the "uploading" (it not being the central point of the story, and this not being the place to have that debate), his "dust theory" is very well grounded. That's not to say that I believe it (or that he does, see http://www.gregegan.net/PERMUTATION/FAQ/FAQ.html), but that doesn't automatically qualify it as "magic" either.

I'd re-read it, Greg Egan is perhaps the hardest Sci-Fi writer out there, everything is rigorously thought out. He used to be a software engineer and hacks on some of his more interesting flights of fancy - check out his website http://gregegan.customer.netspace.net.au/ for some interesting stuff, Quantum Soccer anyone? http://gregegan.customer.netspace.net.au/BORDER/Soccer/Socce.... If NH should have an official Sci-Fi author it should be him ;)

Cool, I've played quantum golf before (which is easy) and quantum tic-tac-toe (which I never quite understood), I'll have to play with quantum soccer.

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